December weather forecast
Londrina, Brazil

By the time December unfolds in Londrina, the weather has transitioned into classic summer conditions — high temperatures, high humidity, and substantial rainfall — with rain quantities reaching 109mm (4.29"). In spite of keeping a high UV index of 6, December also brings the most substantial amount of daily sunlight, reaching 13.6 hours per day, the highest for the year. Uninterrupted activities, prolonged daylight, and typical summer weather make December an intriguing month filled with joyful festivals, celebrations, and outdoor fun in Londrina.

Temperature

Londrina welcomes December with a high-temperature average of a still moderately hot 28.5°C (83.3°F), corresponding to the preceding month. Londrina's average low-temperature in the month of December is recorded at an enjoyable 19.2°C (66.6°F).

Heat index

The heat index value during December is estimated at a tropical 34°C (93.2°F). Undertake enhanced precautions, heat exhaustion and heat cramps are possible risks. Continuous activity could trigger heatstroke.
Data suggests that the heat index is set for environments in shade and with a light wind. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'real feel' or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young ones regularly neglect the requirement for rest and fluid replenishment. Thirst is a late stage of dehydration - so, it is necessary to keep hydrated, particularly during extended periods of physical exertion.

Humidity

In Londrina, Brazil, the average relative humidity in December is 82%.

Rainfall

In Londrina, in December, it is raining for 22.3 days, with typically 109mm (4.29") of accumulated precipitation. Throughout the year, in Londrina, there are 185.2 rainfall days, and 1015mm (39.96") of precipitation is accumulated.

Daylight

December has the longest days of the year in Londrina, with an average of 13h and 30min of daylight.
On the first day of December in Londrina, sunrise is at 05:29 and sunset at 18:57. On the last day of the month, sunrise is at 05:41 and sunset at 19:14 -03.

Sunshine

In Londrina, the average sunshine in December is 7.8h.

UV index

January through March, August through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 6 in December interprets into the following recommendations:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.